CN1321262A - Compressor drive - Google Patents
Compressor drive Download PDFInfo
- Publication number
- CN1321262A CN1321262A CN00801853.7A CN00801853A CN1321262A CN 1321262 A CN1321262 A CN 1321262A CN 00801853 A CN00801853 A CN 00801853A CN 1321262 A CN1321262 A CN 1321262A
- Authority
- CN
- China
- Prior art keywords
- control system
- fluid flow
- compressor
- flow control
- drive signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 45
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 239000003550 marker Substances 0.000 claims description 30
- 230000004888 barrier function Effects 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000036962 time dependent Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
- F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D33/00—Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0676—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on flow sources
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Reciprocating Pumps (AREA)
- Seal Device For Vehicle (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
A fluid flow control system for an electromagnetic pump having an electromagnetic drive (11) and a compressor (6). The control system establishes a required current in the compressor coils (10) to control the position and movement of the actuator (11), the actuator deflecting a diaphragm within the pump to provide the required flow. The control system includes a command signal generator (1) to create a signal representing the required flow, the signal is applied to a command processor (2) with any feedback signal(s) (13) for example, coil current, actuator displacement. The command processor (2) calculates the appropriate drive signal defined by mark-space ratio, repetition rate and amplitude. The drive signal controls the voltage supplied to the compressor coils (11) resulting in a required coil current to provide the desired flow. A dc power supply is used to avoid problems regarding mains power supply and frequency.
Description
The present invention relates to a kind of fluid flow control system, particularly a kind of fluid flow control system that is used for electromagnetic pump, this pump can provide required changeable flow arbitrarily.
Usually electromagnetic pump is by grid power driving work, and the compressor in the electromagnetic pump directly drives work by the single phase poaer supply that driven by power input voltage and frequency are provided.Thereby these compressors work under constant flow, and the control of any fluid flow only depends on ON/OFF control or fluid pressure condition.Needed flow obtains by the control and the design of convection cell transit system.
This compressor has the reciprocating type actuator of straight line or arcuate movement, and this reciprocating type actuator is driven by electromagnetic actuator device, and electromagnetic actuator device is with supply voltage and frequency energize.The electromagnetic actuator device driving actuator is carried out reciprocating machine motion, thisly moves through barrier film and valve makes fluid flow to one or more outlets from the inlet of one or more compressors.
There is a series of problem in this method, comprises that the design of compressor has to change with supply voltage and frequency, complicate fabrication process, and expense increases.And the control of flow can only lean on the setting of air pipe line, reduced the operation life of compressor, and compressor has to work under maximum load condition, causes maximum noise and vibration.
In addition, the performance of compressor depends on the mechanical property of its parts to a great extent, as the rigidity of barrier film, and moving-member, and the pressure of pump compressed air.
Any owing to the difference between the machine of manufacture process generation, or the variation of the difference of running environment condition and purposes, the extra variation of compressor performance all will be caused.
The objective of the invention is for electromagnetic pump provides a kind of fluid control systems, make it not rely on supply voltage and frequency and under the optimal performance condition of pump, provide needed fluid flow.
Therefore, the invention provides a kind of fluid flow control system of electromagnetic pump, comprise the electromagnetic actuator device in the compressor, this control system is supplied with the drive signal of pressing the pulse width modulated to electromagnetic actuator device, so that a predefined pump discharge to be provided, this drive signal is produced by a direct voltage source.
Preferably, comprise a string transformable marker spacing than (mark space ratio) pulse by the drive signal of pulse width modulated, this pulse has definite repetition rate and amplitude.By changing the marker spacing ratio in time and stipulating its repetition rate and amplitude, a drive signal corresponding with the requirement flow just can obtain.
Preferably, electromagnetic actuator device comprise magnetic material stator, be used for stator is carried out field copper and a removable magnetic part that links to each other with the actuator of compressor of magnetic pumping.The deflection of actuator causes the corresponding deflection of appended barrier film, and causes and the flowing of the contacted any fluid of barrier film.
Preferably, the electromagnetic actuator device with the barrier film combination provides a kind of conversion of being flowed to fluid by electric energy.
Preferably, control the momentary current of field copper by the drive signal of pulse width modulated.The fluid that this electric current is controlled in the compressor by control actuator deflection amplitude and repetition rate flows.
Preferably, the marker spacing of drive signal is than the waveform that is defined as about half sine wave in time.
Preferably, the drive signal by the pulse width modulated is substantially uniform amplitude.Pulse-length modulation control assurance compressor from direct supply is always worked under optimum efficiency in any application scenario, and compressor performance and power supply type or variation are irrelevant, and can use battery to make pump operation.Therefore, drive the compressor cause by existing fixed frequency supply voltage and the relevant issues of pump are avoided.
According to a further aspect in the invention, a kind of fluid flow control system that is used for electromagnetic pump is provided, comprise the electromagnetic actuator device in the compressor, this control system is supplied with the low-voltage driving signal of the pulse-length modulation of uniform amplitude substantially to electromagnetic actuator device, with the amplitude and the repetition rate of control electromagnetic actuator device coil current, the driving actuator in order in compressor, to produce a required flow output.
Describe the preferred embodiments of the present invention below with reference to accompanying drawings in detail:
Fig. 1 is the schematic block diagram of fluid flow control system of the present invention;
Fig. 2 a represents the bipolar voltage drive signal;
Fig. 2 b represents the unipolarity drive signal by marker spacing/repetition rate generator generation;
Fig. 2 c represents actuator current;
Fig. 3 is a schematic block diagram, represents an embodiment of control system shown in Figure 1, and it is to a bladder (bladder) conveyance fluid;
Fig. 4 is a schematic block diagram, represents another embodiment of control system shown in Figure 1, and it is to a bladder conveyance fluid;
Fig. 5 is a schematic block diagram, represents another embodiment of control system shown in Figure 1, and it is to a bladder conveyance fluid;
Fig. 6 is a schematic block diagram, represents the further embodiment of control system shown in Figure 1, and it is to a bladder conveyance fluid;
With reference to block scheme shown in Figure 1, this block scheme is represented a controlled fluid flow system, and it comprises a control system, fluid passage, a bladder system (7) and a compressor wherein, have the one or more barrier films (12) that link to each other with an electromagnetic actuators (11) in the compressor.
This control system goes up at the coil (10) of compressor (6) at any time and produces needed electric current.The position of coil current control actuator (11), actuator makes barrier film (12) do corresponding deflection, flows thereby make with the contacted fluid of barrier film (12).Control fluid flowing in compressor (6) by the electric current of control coil (10).
A command signal corresponding with required flow offers instruction processing unit (2) by command generator (1) generation and with other feedback signal (13), and these feedback signals result from coil current sensor, actuator position sensor, bladder flow sensor and bladder pressure transducer.They provide the instantaneous coil current of reflection, actuator displacement, the turnover flow of bladder system (7) and the signal of bladder system (7) pressure.
The output signal of command generator (1) and feedback signal (13) are handled by instruction processing unit (2), and processing procedure uses a kind of representative to be driven pneumatic, the machinery of compressor and the control algolithm of electrical specification.According to this control algolithm, suitable drive signal is determined than, repetition rate and amplitude parameter by the marker spacing and is calculated.
The amplitude of drive signal is by the power interface in amplitude controller (5) the appropriate change power amplifier (4), thereby changes the direct current supply voltage of ' H ' bridge driver (15) and obtain.Drive signal marker spacing ratio and repetition rate obtain from marker spacing and the repetition rate generator that is operated under the suitable parameter value.This generator provides the one pole drive signal to ' H ' bridge driver (15), provides the bipolar voltage drive signal to compressor coil (10) again by this driver.
This act on the compressor coil the bipolar voltage drive signal (Fig. 2 a) can be by repetition rate 1/A, the marker spacing than B/A and+V and-amplitude that switches between the V represents.V is a voltage, is in close proximity to the service voltage of ' H ' bridge driver (15).Typical V value is about 12 volts, and repetition rate is several KHz simultaneously, and the marker spacing is than being lower than the paramount variation between 99 percent of one of percentage.
If in order to obtain suitable compressor flowrate, requirement has one in the actuator current (Fig. 2 c) of X in the period, then in the whole X time period, generator (3) will provide the marker spacing ratio that is similar to two half-sine waves (Fig. 2 b), each crosses over the X/2 time period, and uniform repetition rate is arranged.(Fig. 2 change action a) combines and will will produce a complete bipolar actuator coil current near sine wave in the time period at the X that requires this drive signal with ' H ' bridge-drive.Usually, the X value is bigger ten to 100 times than the A value, and it will make a drive signal repetition rate more much bigger than 1/X.
The bipolar current of compressor coil makes relative its non-energy storage position of actuator that the displacement of positive and negative both direction can be arranged.The displacement of actuator makes barrier film (12) produce the deflection of defined amount, thereby the fluid that sets flow is provided.Power amplifier (4) is to be powered or powered by dc-battery by voltage stabilizing or non-constant voltage dc source by primary power.
For the skilled professional and technical personnel in this area, any is arranged is tangible, be the present invention except that pointed place, other can realize by combination, the digital circuit of mimic channel or the main frame that comprises microprocessor system as command generator, marker spacing and repetition rate generator, instruction processing unit, direct supply, power amplifier and amplitude controller.
For the professional and technical personnel, have a bit equally clearly, promptly as without barrier film, can also make the fluid of turnover bladder system flow controlled with other exhaust apparatus such as piston, guide vane, screw rod.
Fig. 3 represents a most preferred embodiment of the present invention, and wherein, the compressor outlet flow characteristics: the flow, the temperature and pressure that are changing are known.In this example, the command signal of corresponding required flow produces and delivers to instruction processing unit (2) by command generator (1).Instruction processing unit (2) is determined repetition rate and marker spacing ratio, and offers marker spacing and repetition rate generator (3).The marker spacing that so just produces a variable repetition rate and change at any time is than waveform, and this waveform is represented electric current required in the coil of compressor (6).This waveform is sent to power amplifier (4), and wherein, it is controlled by amplitude by amplitude controller (5), and amplitude is determined by instruction processing unit (2).The output of power amplifier (4) provides a voltage, and its amplitude repetition rate and marker spacing are than being controlled by instruction processing unit.This voltage acts on the coil of compressor (6), produces a known electric current, makes compressor bellows (bellows) produce a known deflection, therefore produces a known flow that flows to bladder system (7) by fluid passage system (8).Direct supply (9) is used.
Fig. 4 represents schematic block diagram that fluid flow system shown in Figure 3 is controlled, and different with control system shown in Figure 3 is that it is controlled the position of actuator in the compressor by the signal feedback of actuator position.This control method has been eliminated the influence that is brought by the unknown deviation between drive signal and real actuator deflection of electromagnetic actuator device generation.
The command signal of a required flow of representative produces and appends on interior actuator position sensor (10) signal of instruction processing unit (2) by command generator (1), and an error signal will be provided like this, guarantees the accurate location of driver thus.The error signal that comes from instruction processing unit (2) is determined repetition rate and marker spacing ratio, and delivers to marker spacing and repetition rate generator (3).So just produce a variable repetition rate and time dependent marker spacing than waveform, represented the required electric current of coil of compressor (6).This waveform is sent to power amplifier (4), and wherein, it is controlled by amplitude by amplitude controller (5), and amplitude is determined by instruction processing unit (2).The output of power amplifier (4) provides a voltage, and its amplitude repetition rate and marker spacing are than being controlled by instruction processing unit (2) and actuator position sensor (10).This voltage acts on the coil of compressor (6), makes the compressor bellows produce a known deflection, thereby produces a known flow that flows to bladder system (7) by fluid passage system (8).Also adopt direct supply (9) in the present embodiment.
Fig. 5 is the schematic block diagram of a flow control system, and its principle is based on by the flow of monitoring actual inflow bladder and controls needed flow.
The command signal of a required flow of representative produces and appends on the information from flow sensor (10) (information) in the instruction processing unit (2) by command generator (1), will provide an error signal like this, so that revise any error of required flow.The error signal that comes from instruction processing unit (2) is determined repetition rate and marker spacing ratio, and delivers to marker spacing and repetition rate generator (3).This has just produced a variable repetition rate and time dependent marker spacing than waveform, represents the required electric current of coil of compressor (6).This waveform is sent to power amplifier (4), and wherein, its amplitude is controlled by amplitude controller (5), and amplitude is determined by instruction processing unit (2).The output of power amplifier (4) provides a voltage, and its amplitude repetition rate and marker spacing are than being controlled by instruction processing unit (2) and flow sensor (10).This voltage acts on the coil of compressor (6), makes the compressor bellows produce a known deflection, thereby produces the flow that flows to bladder system (7) by fluid passage system (8).By the detected any flow error of flow sensor (10), be taken as corrected signal and send into instruction processing unit (2).Adopt direct supply (9) in the present embodiment.
Perhaps, do not monitor flow, and can monitor the actual pressure in the bladder.Fig. 6 is the schematic block diagram of this control system.
As shown in Figure 6, the command signal of a required flow of representative is produced and appends in the instruction processing unit (2) on the information from pressure transducer (10) by command generator (1), will provide an error signal like this, so that revise any error of required bladder system (7) pressure.The error signal that comes from instruction processing unit (2) is determined repetition rate and marker spacing ratio, and delivers to marker spacing and repetition rate generator (3).This has just produced a variable repetition rate and time dependent marker spacing than waveform, represents the required electric current of coil of compressor (6).This waveform is sent to power amplifier (4), and wherein it is controlled by amplitude by amplitude controller (5), and amplitude is determined by instruction processing unit (2).The output of power amplifier (4) provides a voltage, and wherein amplitude repetition rate and marker spacing are than being controlled by instruction processing unit (2) and pressure transducer (10).This voltage acts on the coil of compressor (6), makes the compressor bellows produce a known deflection, thereby produces the flow that flows to bladder system (7) by fluid passage system (8).By the detected any pressure error of pressure transducer (10), be taken as corrected signal and send into instruction processing unit (2).Adopt direct supply (9) in the present embodiment.
Claims (14)
1. fluid flow control system that is used for electromagnetic pump, be included in the electromagnetic actuator device in the compressor, this control system provides a drive signal by the pulse width modulated to electromagnetic actuator device, and so that a predetermined pump discharge to be provided, drive signal is produced by a direct current power supply.
2. fluid flow control system according to claim 1 wherein, comprises a string transformable marker spacing than pulse by the drive signal of pulse width modulated, and this pulse has the repetition rate and the amplitude of regulation.
3. fluid flow control system according to claim 1 and 2, wherein, electromagnetic actuator device comprise magnetic material stator, be used for stator is carried out the field copper of magnetic pumping and the removable magnetic part that links to each other with the compressor actuator.
4. fluid flow control system according to claim 3, wherein, the electromagnetic actuator device that makes up with barrier film provides a kind of conversion of being flowed to fluid by electric energy.
5. according to the described fluid flow control system of above any one claim, wherein, control the interior momentary current of field copper by the drive signal of pulse width modulated.
6. fluid flow control system according to claim 5, wherein, the marker spacing of drive signal is defined as about half sine-wave current waveform than in time.
7. fluid flow control system according to claim 6 wherein, is essentially uniform amplitude by the drive signal of pulse width modulated.
8. fluid flow control system that is used for electromagnetic pump, be included in the electromagnetic actuator device in the compressor, this control system provides a low-voltage driving signal that is essentially uniform amplitude by the pulse width modulated to electromagnetic actuator device, amplitude and repetition rate with control electromagnetic actuator device coil current, driving actuator, thus make compressor produce desired flow output.
9. a fluid flow control system that is used for electromagnetic pump is included in the electromagnetic actuator device in the compressor, and this control system comprises: a command generator produces and the relevant command signal of predetermined expectation flow; Sensor, the state of detection system, and the feedback signal that feedback signal, command signal is provided and handles by instruction processing unit; Instruction processing unit provides drive signal output, and the voltage of control action on the compressor winding; Described drive signal is determined by marker spacing ratio, repetition rate and amplitude.
10. fluid flow control system according to claim 9, wherein, sensor provides the feedback of instantaneous coil current.
11. fluid flow control system according to claim 9, wherein, sensor provides the feedback of actuator displacement.
12. fluid flow control system according to claim 9, wherein, sensor provides the feedback of bladder system pressure.
13. fluid flow control system according to claim 9, wherein, sensor provides into/goes out the feedback of bladder system fluid flow.
14. according to above explanation and with reference to the fluid flow control system of accompanying drawing 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9917961A GB2352890B (en) | 1999-07-31 | 1999-07-31 | Compressor drive |
| GB9917961.6 | 1999-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1321262A true CN1321262A (en) | 2001-11-07 |
| CN1178115C CN1178115C (en) | 2004-12-01 |
Family
ID=10858267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008018537A Expired - Fee Related CN1178115C (en) | 1999-07-31 | 2000-07-28 | Compressor drive |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US7038419B1 (en) |
| EP (1) | EP1118048B1 (en) |
| JP (1) | JP2003510494A (en) |
| CN (1) | CN1178115C (en) |
| AT (1) | ATE289430T1 (en) |
| AU (1) | AU757146B2 (en) |
| DE (1) | DE60018155T2 (en) |
| DK (1) | DK1118048T3 (en) |
| ES (1) | ES2235920T3 (en) |
| GB (1) | GB2352890B (en) |
| TW (1) | TW509830B (en) |
| WO (1) | WO2001009695A1 (en) |
| ZA (1) | ZA200102597B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245776B (en) * | 2007-02-16 | 2012-08-29 | 卓越剂量技术有限公司 | Magnetic driven metering pump |
| CN104010567A (en) * | 2012-01-16 | 2014-08-27 | 欧姆龙健康医疗事业株式会社 | Blood pressure measurement device and blood pressure measurement device control method |
| CN113339281A (en) * | 2021-06-24 | 2021-09-03 | 中国原子能科学研究院 | Nuclear power supply electromagnetic pump parallel drive controller |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW526056B (en) * | 2001-03-15 | 2003-04-01 | Huntleigh Technology Plc | Inflatable support |
| JP4624658B2 (en) * | 2003-09-22 | 2011-02-02 | 株式会社川本製作所 | Diaphragm pump unit using reciprocating motor |
| US8087113B2 (en) | 2005-05-12 | 2012-01-03 | Hunteigh Technology Limited | Inflatable support |
| US8745788B2 (en) | 2005-07-26 | 2014-06-10 | Hill-Rom Services. Inc. | System and method for controlling an air mattress |
| DE102005039772A1 (en) * | 2005-08-22 | 2007-03-08 | Prominent Dosiertechnik Gmbh | solenoid |
| US8465263B2 (en) * | 2009-06-22 | 2013-06-18 | Wagner Spray Tech Corporation | Dynamic control of an electric drive |
| US8260475B2 (en) | 2009-11-19 | 2012-09-04 | Hill-Rom Services, Inc. | Constant low-flow air source control system and method |
| KR101181096B1 (en) * | 2010-08-30 | 2012-09-07 | 기아자동차주식회사 | A air conditioning system for car |
| US8429778B2 (en) | 2011-04-11 | 2013-04-30 | Hill-Rom Services, Inc. | Low noise linear diaphragm compressor by variable amplitude driver |
| US8973186B2 (en) | 2011-12-08 | 2015-03-10 | Hill-Rom Services, Inc. | Optimization of the operation of a patient-support apparatus based on patient response |
| US10649471B2 (en) * | 2018-02-02 | 2020-05-12 | Mks Instruments, Inc. | Method and apparatus for pulse gas delivery with isolation valves |
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| US4806833A (en) * | 1986-09-22 | 1989-02-21 | General Electric Company | System for conditioning air, method of operating such, and circuit |
| FI80606C (en) * | 1987-10-05 | 1990-07-10 | Kemira Oy | FOERFARANDE FOER REGLERING AV LUFTMAONGDEN SOM MATAS IN I EN GASMASK SAMT EN GASMASK SOM GENOMFOER DENNA FOERFARANDE. |
| JP2582635B2 (en) * | 1989-02-23 | 1997-02-19 | 日本コントロール工業株式会社 | Drive device for electromagnetic pump |
| US5022587A (en) * | 1989-06-07 | 1991-06-11 | Hochstein Peter A | Battery powered nebulizer |
| US5107713A (en) * | 1990-03-16 | 1992-04-28 | A.P. Buck, Inc. | Air sampling pump |
| GB2253099B (en) * | 1991-02-20 | 1995-04-26 | Hitachi Ltd | Method and apparatus for control of inverter |
| FI100307B (en) * | 1994-02-25 | 1997-11-14 | Kemira Safety Oy | A method for adjusting the amount of air supplied to a gas mask and Amari as a gas |
| US5448141A (en) * | 1994-03-18 | 1995-09-05 | North Carolina State University | Adjustable speed drive for residential applications |
| GB9409989D0 (en) | 1994-05-18 | 1994-07-06 | Huntleigh Technology Plc | Magnetic actuator |
| US5736823A (en) * | 1994-05-27 | 1998-04-07 | Emerson Electric Co. | Constant air flow control apparatus and method |
| JPH08271024A (en) * | 1995-03-31 | 1996-10-18 | Toshiba Ave Corp | Air conditioner |
| GB9515542D0 (en) * | 1995-07-28 | 1995-09-27 | Lucas Ind Plc | Accumulator pressure control in vehicle brake systems |
| US6206652B1 (en) * | 1998-08-25 | 2001-03-27 | Copeland Corporation | Compressor capacity modulation |
| US6118239A (en) * | 1998-11-23 | 2000-09-12 | Kadah; Andrew S. | Speed control drive circuit for blower motor |
-
1999
- 1999-07-31 GB GB9917961A patent/GB2352890B/en not_active Revoked
-
2000
- 2000-07-28 EP EP00949735A patent/EP1118048B1/en not_active Expired - Lifetime
- 2000-07-28 WO PCT/GB2000/002931 patent/WO2001009695A1/en active IP Right Grant
- 2000-07-28 CN CNB008018537A patent/CN1178115C/en not_active Expired - Fee Related
- 2000-07-28 JP JP2001526622A patent/JP2003510494A/en active Pending
- 2000-07-28 DE DE60018155T patent/DE60018155T2/en not_active Expired - Lifetime
- 2000-07-28 AU AU63010/00A patent/AU757146B2/en not_active Ceased
- 2000-07-28 US US09/806,713 patent/US7038419B1/en not_active Expired - Lifetime
- 2000-07-28 AT AT00949735T patent/ATE289430T1/en not_active IP Right Cessation
- 2000-07-28 DK DK00949735T patent/DK1118048T3/en active
- 2000-07-28 ES ES00949735T patent/ES2235920T3/en not_active Expired - Lifetime
- 2000-08-04 TW TW089115699A patent/TW509830B/en not_active IP Right Cessation
-
2001
- 2001-03-29 ZA ZA2001/02597A patent/ZA200102597B/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245776B (en) * | 2007-02-16 | 2012-08-29 | 卓越剂量技术有限公司 | Magnetic driven metering pump |
| CN104010567A (en) * | 2012-01-16 | 2014-08-27 | 欧姆龙健康医疗事业株式会社 | Blood pressure measurement device and blood pressure measurement device control method |
| CN104010567B (en) * | 2012-01-16 | 2016-04-06 | 欧姆龙健康医疗事业株式会社 | Blood pressure measurement apparatus |
| CN113339281A (en) * | 2021-06-24 | 2021-09-03 | 中国原子能科学研究院 | Nuclear power supply electromagnetic pump parallel drive controller |
| CN113339281B (en) * | 2021-06-24 | 2022-07-01 | 中国原子能科学研究院 | Nuclear power supply electromagnetic pump parallel drive controller |
Also Published As
| Publication number | Publication date |
|---|---|
| AU757146B2 (en) | 2003-02-06 |
| GB2352890B (en) | 2001-06-20 |
| WO2001009695A1 (en) | 2001-02-08 |
| US7038419B1 (en) | 2006-05-02 |
| ATE289430T1 (en) | 2005-03-15 |
| TW509830B (en) | 2002-11-11 |
| GB2352890A (en) | 2001-02-07 |
| ES2235920T3 (en) | 2005-07-16 |
| DK1118048T3 (en) | 2005-06-20 |
| CN1178115C (en) | 2004-12-01 |
| JP2003510494A (en) | 2003-03-18 |
| ZA200102597B (en) | 2002-06-26 |
| EP1118048B1 (en) | 2005-02-16 |
| DE60018155T2 (en) | 2005-12-29 |
| AU6301000A (en) | 2001-02-19 |
| GB9917961D0 (en) | 1999-09-29 |
| DE60018155D1 (en) | 2005-03-24 |
| EP1118048A1 (en) | 2001-07-25 |
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